Thoracic Cage Notes

7-8 The Thoracic Cage The Thoracic Cage The Rib Cage __________________ Supports the thoracic cavity Consists of: ________________ Ribs ___________________ The Rib Cage Formed of ribs and sternum

Figure 7-23a The Thoracic Cage Jugular notch T1 Clavicular articulation 1 Manubrium 2 3 Sternum Body True ribs (ribs 1–7) 4 Xiphoid process 5 Costal cartilages 10 T11 6 T12 11 7 Vertebrochondral ribs (ribs 8–10) 12 8 9 False ribs (ribs 8–12) Floating ribs (ribs 11–12) An anterior view, showing the costal cartilages and the sternum 3

Figure 7-23b The Thoracic Cage 1 T1 1 2 T2 2 3 3 T3 4 T4 4 5 T5 5 True ribs (ribs 1–7) 6 T6 6 7 T7 7 8 T8 8 T9 9 9 T10 10 T11 10 False ribs (ribs 8–12) 11 T12 11 12 12 L1 A posterior view, showing the articulations of the ribs and vertebrae 4

7-8 The Thoracic Cage Functions of the Thoracic Cage ________________________ Heart, lungs, and thymus Attaches muscles For respiration _________________ Of the pectoral girdle and the upper limbs

thoracic cavity is similar to the movement of a Figure 7-24c The Ribs Sternum Ribs The effect of rib movement on the thoracic cavity is similar to the movement of a bucket handle. Elevation of curved ribs increases the volume of the thoracic cavity. 6

7-8 The Thoracic Cage Ribs (Costae) _________________________ Extending from the thoracic vertebrae Ribs are divided into two types True ribs ______________

7-8 The Thoracic Cage Ribs 1–7 (True Ribs) ____________________ Connected to the sternum by costal cartilages

7-8 The Thoracic Cage __________________ Vertebrochondral ribs (ribs 8–10) Fuse together Merge with cartilage before reaching the sternum Floating or vertebral ribs (ribs 11–12) Connect only to the vertebrae and back muscles __________________________

Figure 7-23a The Thoracic Cage Jugular notch T1 Clavicular articulation 1 Manubrium 2 3 Sternum Body True ribs (ribs 1–7) 4 Xiphoid process 5 Costal cartilages 10 T11 6 T12 11 7 Vertebrochondral ribs (ribs 8–10) 12 8 9 False ribs (ribs 8–12) Floating ribs (ribs 11–12) An anterior view, showing the costal cartilages and the sternum 10

7-8 The Thoracic Cage Structures of the Ribs The head (capitulum) At the vertebral end of the rib Has superior and inferior articular facets The neck The short area between the head and the tubercle

7-8 The Thoracic Cage Structures of the Ribs ________________________ Attaches muscles of the pectoral girdle and trunk Attaches to the intercostal muscles that move the ribs

A superior view of the details of rib Figure 7-24a The Ribs Transverse costal facet Tubercle of rib Angle Neck Vertebral end Demifacet Head (capitulum) A superior view of the details of rib structure and the articulations between the ribs and thoracic vertebrae. 13

A posterior view of the head of a Figure 7-24b The Ribs Head Neck Attachment to costal cartilage (sternal end) Articular facets Tubercle Body Angle Costal groove A posterior view of the head of a representative rib from the right side (ribs 2–9). 14

7-8 The Thoracic Cage The Sternum _____________ In the midline of the thoracic wall Three parts of the sternum _______________ The sternal body ______________

7-8 The Thoracic Cage Manubrium The superior portion of sternum Broad, triangular shape _________________________ Articulates with cartilages of first rib pair Has a jugular notch, a shallow indentation between clavicular articulations

7-8 The Thoracic Cage The Sternal Body The Xiphoid Process _______________ Attaches to the manubrium _______________________ The Xiphoid Process ______________________ Attaches to the sternal body Attaches to diaphragm and rectus abdominis muscles

Figure 7-23a The Thoracic Cage Jugular notch T1 Clavicular articulation 1 Manubrium 2 3 Sternum Body True ribs (ribs 1–7) 4 Xiphoid process 5 Costal cartilages 10 T11 6 T12 11 7 Vertebrochondral ribs (ribs 8–10) 12 8 9 False ribs (ribs 8–12) Floating ribs (ribs 11–12) An anterior view, showing the costal cartilages and the sternum 18

7-8 The Thoracic Cage Development of the Sternum The developing sternal body _______________________ Completes fusion about age 25 Leaving transverse lines The xiphoid process _____________________ Can easily be broken away

PROCEDURE Go to vertebrae and thoracic cage link on my weebly Complete spine order, vertebrae 1,2, and 3, and thoracic 1 and 2. Show me each when done Then complete axial skeleton quiz 1 and 2-links on my weebly-show me when done Last, complete axial skeletal quiz-link on weebly